1|Page
CWEA Wastewater Process Optimization Exam
Practice Questions And Correct Answers||Verified
Exam!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
What is the purpose of centralized waste treatment
facilities? - Answer-To treat hazardous liquid wastes
Define molarity - Answer-The number of moles of solute
dissolved per liter of solution. Molarity = moles of
solute/liter of solution
What are the types of stormwater pollution? - Answer-
Sediment, BOD, nutrients
Low pH wastewater is neutralized using what? - Answer-
NaOH (Sodium Hydroxide)
Sodium Hydroxide is commonly referred to as what? -
Answer-Caustic Soda
Lower pH's have a higher concentration of hydrogen ions -
Answer-True
,2|Page
What is NaOH? - Answer-Sodium Hydroxide
A confined space is one that: - Answer-Is large enough to
enter and work in, has a restricted entry/exit, and is not
mean for continuous occupancy.
What is the formula for calculating the volume of a
cylinder? - Answer-V = πr^2h (π = 3.1415)
Which acid is an organic acid? - Answer-Acetic Acid
(C2H4O2)
Which criteria are used to determine if a violation is
significant noncompliance? - Answer-Discharge of
pollutants that has caused imminent endangerment to
human health. Failure to accurately report noncompliance.
Failure to provide required reports within 30 days after due
date.
What actions are considered by a POTW for serious
violations of the wastewater ordinance? - Answer-
,3|Page
Suspension of WDP. Revocation of WDP. Filing criminal
actions.
What options are available if a request to perform an
inspection is denied? - Answer-Call supervisor for
direction. Leave and immediately collect samples for
analysis. Leave and try again later. Issue a citation for
denial of access. Exercise your authority to enter the
facility without company permission.
Generally, a pH lower than _ and higher than _ can hinder
the biological treatment process. - Answer-6, 8
High concentrations of heavy metals may limit what? -
Answer-Application of sludge in land spreading
BOD is what? - Answer-The rate at which organisms use
the oxygen in water or wastewater while stability
decomposable organic matter under aerobic conditions. In
decomposition, organic matter serves as food for the
bacteria, and energy results from its oxidation. BOD
measurements are used as a measure of the organic
strength of wastes in water.
, 4|Page
Biological treatment typically does not _ inorganics.
(Except inorganic nitrogen + sulfur compounds) - Answer-
alter
What is equalization as it pertains to "physical" treatment?
- Answer-Equalization combines waste streams to dampen
fluctuations in flow rates and composition prior to
discharge. It is a "wide spot" in the line and helps prevent
shock loads, or flow variations as the flow can be
controlled.
What is ultrafiltration? - Answer-A membrane filter process
used for the removal of some organic compounds in an
aqueous (watery) solution.
Define reverse osmosis - Answer-The application of
pressure to a concentrated solution which causes the
passage of a liquid from the concentrated solution to a
weaker solution across a semipermeable membrane.
Membrane allows passage of water (solvent) but not the
dissolved solids (solutes). In reverse osmosis, two liquids
are produced: 1) the reject (containing high concentrations
of dissolved solids) 2) the permeate (containing low
concentrations)
CWEA Wastewater Process Optimization Exam
Practice Questions And Correct Answers||Verified
Exam!!|| (Verified Answers) Plus Rationale 2026/2027
Q&A| Instant Download Pdf
What is the purpose of centralized waste treatment
facilities? - Answer-To treat hazardous liquid wastes
Define molarity - Answer-The number of moles of solute
dissolved per liter of solution. Molarity = moles of
solute/liter of solution
What are the types of stormwater pollution? - Answer-
Sediment, BOD, nutrients
Low pH wastewater is neutralized using what? - Answer-
NaOH (Sodium Hydroxide)
Sodium Hydroxide is commonly referred to as what? -
Answer-Caustic Soda
Lower pH's have a higher concentration of hydrogen ions -
Answer-True
,2|Page
What is NaOH? - Answer-Sodium Hydroxide
A confined space is one that: - Answer-Is large enough to
enter and work in, has a restricted entry/exit, and is not
mean for continuous occupancy.
What is the formula for calculating the volume of a
cylinder? - Answer-V = πr^2h (π = 3.1415)
Which acid is an organic acid? - Answer-Acetic Acid
(C2H4O2)
Which criteria are used to determine if a violation is
significant noncompliance? - Answer-Discharge of
pollutants that has caused imminent endangerment to
human health. Failure to accurately report noncompliance.
Failure to provide required reports within 30 days after due
date.
What actions are considered by a POTW for serious
violations of the wastewater ordinance? - Answer-
,3|Page
Suspension of WDP. Revocation of WDP. Filing criminal
actions.
What options are available if a request to perform an
inspection is denied? - Answer-Call supervisor for
direction. Leave and immediately collect samples for
analysis. Leave and try again later. Issue a citation for
denial of access. Exercise your authority to enter the
facility without company permission.
Generally, a pH lower than _ and higher than _ can hinder
the biological treatment process. - Answer-6, 8
High concentrations of heavy metals may limit what? -
Answer-Application of sludge in land spreading
BOD is what? - Answer-The rate at which organisms use
the oxygen in water or wastewater while stability
decomposable organic matter under aerobic conditions. In
decomposition, organic matter serves as food for the
bacteria, and energy results from its oxidation. BOD
measurements are used as a measure of the organic
strength of wastes in water.
, 4|Page
Biological treatment typically does not _ inorganics.
(Except inorganic nitrogen + sulfur compounds) - Answer-
alter
What is equalization as it pertains to "physical" treatment?
- Answer-Equalization combines waste streams to dampen
fluctuations in flow rates and composition prior to
discharge. It is a "wide spot" in the line and helps prevent
shock loads, or flow variations as the flow can be
controlled.
What is ultrafiltration? - Answer-A membrane filter process
used for the removal of some organic compounds in an
aqueous (watery) solution.
Define reverse osmosis - Answer-The application of
pressure to a concentrated solution which causes the
passage of a liquid from the concentrated solution to a
weaker solution across a semipermeable membrane.
Membrane allows passage of water (solvent) but not the
dissolved solids (solutes). In reverse osmosis, two liquids
are produced: 1) the reject (containing high concentrations
of dissolved solids) 2) the permeate (containing low
concentrations)
